How to Get String Length in MongoDB

In MongoDB, string length refers to the number of characters in a string field stored within a document. This length can be calculated dynamically during queries to perform data validation, filtering, or aggregation tasks. Below are the approaches that help us to understand How to Get String Length in MongoDB as follows:

Using $strLenCP Operator
Using $expr and $size Operators

Let’s set up an Environment:

To understand How to Get String Length in MongoDB we need a collection and some documents on which we will perform various operations and queries. Here we will consider a collection called products which contains the information shown below:

[
  {
    _id: ObjectId('662609de9fe21c773b8bf20c'),
    name: 'Smartphone',
    price: 599
  },
  {
    _id: ObjectId('662609de9fe21c773b8bf20d'),
    name: 'Laptop',
    price: 1299
  },
  {
    _id: ObjectId('662609de9fe21c773b8bf20e'),
    name: 'Headphones',
    price: 99
  },
  {
    _id: ObjectId('662609de9fe21c773b8bf20f'),
    name: 'Tablet',
    price: 399
  },
  {
    _id: ObjectId('662609de9fe21c773b8bf210'),
    name: 'Smartwatch',
    price: 199
  }
]